ICD-10-CM > C00-D49 > C51-C58 > C57 > C57.2 C57.2 Malignant neoplasm of round ligament Non-Billable/Non-Specific Codes C57.20Malignant neoplasm of unspecified round ligamentC57.21Malignant neoplasm of right round ligamentC57.22Malignant neoplasm of left round ligament